The Challen is expected to go for as much as $239,000 -- quite a return on investment considering that it was originally bought for just under $400. Between 1964 and 1980, the piano was famously used by the Beatles and reportedly by Pink Floyd when it recorded its Dark Side of the Moon album. Auctioneer Bonhams says that the piano bears plenty of cigarette burns and coffee stains from its years of use. But no worries, the rustic appeal ups the value of the piano since it serves as a reminder of its incorporation in such legendary tracks.This particular model is known as a 'jangel box' with its optional tone controlled by a third foot pedal, according to the Examiner. The Abbey Road studios, host of the famous Challen Piano, was once under the threat of sale to property developers, but received historic site status by the British government earlier this year.

The auction will take place on August 15 at the Goodwood Vintage Festival in Chichester, Southern England. Meanwhile, in an effort to increase its value, music consultants and auctioneers are scrambling to identify specific tracks in which the Challen Piano was used.